Checking in on Foursquare can get you more than Mayorship — it can get you some pretty sweet deals if you know where to look. More and more businesses are offering up discounts for their Mayors, and even kicking back a little coin just for visiting. Find out how you can save money, get a great deal, and even make a little cash, just by using Foursquare, Loopt Star, or other location-based apps.